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The color identity of your commander is set before the game begins and doesn’t change during the game, even your commander is in a hidden zone (like the hand or library) or an effect changes your commander’s color.
(2011-09-22)

If your commander is a card like Kozilek, Butcher of Truth that has no colors in its color identity, Command Tower’s ability produces no mana.
(2011-09-22)

In formats other than Commander, Command Tower’s ability produces no mana.
(2011-09-22)

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